Actually the whole H1B is a problem for a lot of immigrant workers. Some people I worked with at my previous employer were contracted through Patni. Patni employs foreign workers to companies (mainly Indian) and takes a cut of their pay. Once their visa is up(5 years I think) they have to go back to India for at least a year then re-apply. Also, when they sign contracts with Patni, they sign a non compete where they cannot be hired by the company they work for, cutting Patni out.
Its really a sad thing, and although the people I spoke with were happy to have good jobs in America, they were resentful that even if they worked hard, they couldn't get hired on permanently.